Oh dear! What's wrong with it now?

[Bricktop X PWR]

I had a most unusual experience earlier today.......

I was hard on the power in Sport mode and lifted off abruptly. (upto 70mph)

It's almost as if I took the car by surprise and it........

I can't think of a word to explain it!

It felt like the car was jiggling the power.
Shuffling power between the two motors.

It's like all the wheels had suddenly become terribly un balanced.

Just for a second or two.

Completely weird and unexpected.

It's never done it before and I hope it never does it again!!

From Tinternet....

Cogging can be physically felt as an intermittent “jerking” motion when you rotate the shaft of a conventional brushless motor. Slotless motors do not exhibit this property. In an unenergized state, the rotor can rotate freely because the permanent magnets are not attracted to the nonmagnetic stator coils.

Could be Torque Ripple??

 

[salty]

I had a most unusual experience earlier today.......

I was hard on the power in Sport mode and lifted off abruptly. (upto 70mph)

It's almost as if I took the car by surprise and it........

I can't think of a word to explain it!

It felt like the car was jiggling the power.
Shuffling power between the two motors.

It's like all the wheels had suddenly become terribly un balanced.

Just for a second or two.

Completely weird and unexpected.

It's never done it before and I hope it never does it again!!

From Tinternet....

Cogging can be physically felt as an intermittent “jerking” motion when you rotate the shaft of a conventional brushless motor. Slotless motors do not exhibit this property. In an unenergized state, the rotor can rotate freely because the permanent magnets are not attracted to the nonmagnetic stator coils.

Could be Torque Ripple??

Didn't understand a word of that, Chris.
But doesn't sound good. Chances are it will never happen again.

 

[Ian Key]

Could be Torque Ripple??

Torte Ripple mmm Hope it's raspberry flavoured.

Got to go now for my appointment at Spec Savers.

 

[Anon70]

Any chance the car thought it was cornering or slipping on any of the wheels so it confused the algorithm for DCCS or Torque Vectoring?

 

[Bricktop X PWR]

Any chance the car thought it was cornering or slipping on any of the wheels so it confused the algorithm for DCCS or Torque Vectoring?

View attachment 32108

No, it was in a straight line.

But thanks for that snippet.
It makes more sense now that it was the car trying to deal with something, though God only knows what.

My car is a 'She' though so who knows?

Just having a funny five minutes?

I shall now call my car..... The Wife!

 

[Anon70]

As we all know the definitions of "intelligent" and "smart" lose, a desert full of sand, in translation from Chinese to English

 

[Coulomb]

Could be Torque Ripple??

I don't believe so. Torque ripple is a characteristic of a single motor, not an interaction between front and rear motors.

Perhaps you pushed the motor controller firmware into a buggy, untested situation. Or maybe the 12V battery had some sort of spasm. Or some weird fritzing of the CAN bus.

Or as suggested already, one of the safety systems decided it was time to intervene, and didn't do a stellar job for once.

 

[JonnyG]

Perhaps power changing between front motor and rear motor abruptly ? Software got its knickers in a twist for a second

 

[jamherber]

So on 120 mile trip on Saturday, I had the exact same issue described by Bricktop at the start of this thread, twice on the trip.

Same/similar scenario - hard acceleration from 40mph to ~70mph, abrupt lift off and got this weird shuddering & vibration (far far worse than THAT vibration), almost like back axle was full regen braking with front axle still applying power, causing a horrendous shudder through whole car for a few seconds. Had this twice on same journey - quite disconcerting.

Hoping this isn't a new 'characteristic'! First time I'd experienced it in over 8k miles so hopefully just a software glitch rather than something wearing in the drivetrain.

 

[Bricktop X PWR]

I was just going to ask about mileage.....

I shall boot it hard on the way home shortly, in the same place as last time and see what happens.

Like you said, let's hope its not a new unwanted 'Characteristic' !

 

[Bricktop X PWR]

No.
Didn't do it........
This time.

Curiouser and Curiouser.

 

[Everest]

I shall now call my car..... The Wife!

No.
Didn't do it........
This time.

And you're surprised?

 

[OriginalBigAl]

A watched kettle never boils!
I know, it does, but I'm only repeating what my Mum said.